Abstract: The exploration potential research of Jizhong Depression shows that Wen'an and Lixian are favorable lithostratigraphic reservoir exploration zones. The five advantages in the formation of lithostratigraphic reservoirs in gentle slope zones of petroleum-rich sags are systematically analyzed, seven reservoir models are set up including the up-dip pinch-out sandstone reservoir, the sand lens reservoir, the river sand lithologic reservoir, the stratigraphic overlap reservoir, the stratigraphic unconformity reservoir, structural-lithologic reservoir and structural-stratigraphic reservoir in gentle slope zones, and three lithostratigraphic reservoir accumulation series in the inner, central and outer slope zones are established. The main research route, the control factors of reservoirs and the major methods for the discovery of the two reservoirs, the mid-low channel sandstone reservoir in Wen'an slope outer zone and the lithostratigraphic reservoir in the northern-central Lixian slope zone, are summed up. It could have some guiding effect on the exploration in gentle slope zones of petroleum-rich sags

Key words: rift lacustrine basin, slope zone, lithostratigraphic reservoir, reservoir pattern, reservoir accumulation series, exploration potential